Drill-chuck.



`whereby the tool tegral piece.

FRANK sTAnIN, or" SPBING'FIELD, ilussacmisE'r'rs.l

' DRILL-cinici;`

specification of Letters atent.

'Patented 00520, 1914.

Application led May 6, 1914. Serial Ro. 888,701.

T0 all whom, it may con/fern.'

Be it known that I, FRANK STARIN, a subject of the Emperor ofAustria-Hungary, and residentof the city of Springfield, in the countyof Hampden and State of Massachusetts, have invented certain'new anduseful' Improvements in Drill- Chucks, of which the following is aspecification.

The present invention relates to improvements in chucks for holdingdrills or simi'- lar tools. f

' One of the objects of the invention is to provide a devicev of thistype wherein the several gripping jaws are made of one in- Anotherobject of the invention is to provide coperating means upon the jaws ofthe chuck and upon the shank of the tool, is alwayspositively driven,the jaws serving asalining means only, and to keep the tool from fallingout.

1With these' and other .objects in view,

which will more fully appear as the nature of the invention is betterunderstood, the same consists in the combination, arrangement andvconstruction of parts hereinafter fully described, pointed out in theappended claims and illustrated inthe accompanying drawings, it beingunderstood thatv manychanges may be made in the size and proportion ofthe several parts and details of construction within the scope of theappended claims 'without departing from the spirit or sacrificing any ofthe advantages of the invention.

One of the many possible embodiments of the invention is illustrated inthe accompanying drawings, in which:-

Figure 1 is a central vertical section-taken through a drill chuckconstructed in accordance with the present invention, its jaws beingshown in 'their open positions; Fig. 2 is a section taken'through thejaws of the chuck in va plane at right angles to that of the sectionshown in Fig. 1; and Fig. 3 `is a section taken on line 3-.3 of Fig. 1.

In the drawings, the numeral -10 indicates the chuck body, which is,preferably, formed of steel and cylindrical in shape. Its upper portionv11 is reduced in diameter, and pro` vided with a.` screw threadedsection 12,

above which is disposed the arbor 13 of the chuclnsaid arbor beinnl madeintegral with l the body 10. A conical bore 14 extends centrally in anaxial direction through tbe'body l0 and through' the reduced portion 114of the chuck for the reception of a conical jawbody 1'5.; Inthis bodyis formed a conical bore 17, 1n which is adapted to be seated theconical head 18 of a drill 19, or other analis moved longitudinally intothe body ofv lthe chuck. The head 18 of the tool is flattened at 21,said iattened part being adaptl' ed to be seated in a correspondinglyshaped v recess 22 in the body 15. In diametrically' opposite parts ofthe reduced portion 11 of the chuck are formed longitudinal slots 23 and24, the slot 24 being considerably wider than the slot 23. In alinementwith the said slots is formed'in the jaw-body 15 a. transyerse aperture25, that is, preferably, oblong 1n cross section, asclearly shown inFig. 2 of the drawings,y its width corresponding to 'that of the slot23. The `height of the aperture 25 is considerabl smaller than theheight of either one o the slots 23 or 24.

'In the slot 24 is seated the head 26 of a flat member 27, that extendsthrough the aperture 25 in the head 18 into the slot 23 in thechuck-body 10. The head 26, preferably, closely fits the slot 24, themember 27 fitting in a similar manner the aperture 25 and the slot 23,thereby prevent-ing a relative rotary movement between the jaw-body and.slots23 or 24.` The end of the flat member sertion of the end of a pin0r a proper wrench, by which the said nut may be turned in eitherdirection. The operation of this device is as follows:

AIn Fig. 1 of thel drawings the jaws of the chuck are shown in theiroutermost and open positions. In inserting the tool into the chuck, itsflattened head 21 is entered into the recess `22 in the jaw-body 15, andthen from falling out from the j body the nut 29 turned in theproperdirection to move the body 15 longitudinally inward, wherebythe' jawsthereof are, by reason of the conical configuration of the'bore 14 andthe similar coniguration ofthe outer face of the body 15, caused to.move toward the .axiso the chuck and to grip the tool be- 15 is causedto move longitudinally outward, by which movement the jaws separate topermit the drill or analogous tool, to be 'Withdrawn and replaced.

' That l claim is 1. In a chuck, the combination with` chuck-body havinga central conical bore, the upper end `of said body being reduced-indiameter' and provided ,in diametrically op?,

-posite ortions' thereof with longitudinal slots, v0

slidably'disposed insaid bore, said jawl,body being provided with'a'bore for receiving-the head of the shank of the tool, the 'up- 'per endoi said ljaw-body having a transverse aperture in alineme'nt with thelongia conicallongitudinally slit jaw-` ing member seated in saidaperture and extending into the slots in vsaid chuck-body, the endsofsaid member having screw threads, a nut drawn over the reduced,portion of 'said chuck-body in mesh With'the threads of saidniember, andmeans for holdingsaid nut against longitudinal movement upon saidchuck-body. e

2.'In a chuck, the combination' with a chuck-body having a centralconical bore, of a jaw body slidably disposed' in said bore, ,said jawbody comprising a conical 'longifor. receiving the tool, means ,carriedby said :jaw body in engagement with said' chuckl body forpreventing arelative rotary, motion of Vsaid two bodies, but permitting said 'jaw`body to move longitudinally inward or outward upon said chuck body, andmeans in engage- -ment with saidiirst named means for e'ectvuating the,longitudinal movement of said jaw body. I

Signed at Springfield, in the county of Hampden and StateofMassachusetts, this 29th day of April, A, D. 1914.

.FRANK STARIN.

Witnesses:

ROBERT J. CHisi-IOLM,

'FRITZ lIZRKER.

tudinal slots in said chuck-body, aconnecttudinally slit member providedwith a bore. headvo-the sha-nk of the

